Carbon monoxideDefinition (http://en.wikipedia.org/wiki/Carbon_monoxide) Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly lighter than air. It is toxic to humans and animals when encountered in higher concentrations, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal biological functions. In the atmosphere it is spatially variable, short lived, having a role in the formation of ground-level ozone. (Wikipedia) Preferred Units: N/A Scope Note: N/A This term is used for the following terms: CO
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